Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composite catalyst for NH3-SCR reaction and preparation method and application thereof

A composite catalyst and ion exchange reaction technology, applied in the field of environmental pollution control, can solve problems such as poor HC poisoning ability, poor hydrothermal stability, and narrow temperature operating window

Inactive Publication Date: 2018-06-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
View PDF11 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to overcome existing NH 3 -SCR molecular sieve catalysts have problems such as narrow temperature operating window, poor hydrothermal stability and poor HC poisoning ability. 3 -Composite catalyst for SCR reaction and its preparation method and application, especially one for NH 3 -AEI molecular sieve catalyst for SCR reaction, its preparation method and its application in catalytic purification of nitrogen oxides in mobile source tail gas and / or stationary source flue gas

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite catalyst for NH3-SCR reaction and preparation method and application thereof
  • Composite catalyst for NH3-SCR reaction and preparation method and application thereof
  • Composite catalyst for NH3-SCR reaction and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Its preparation method comprises the following steps:

[0059] (1) AEI molecular sieve is mixed with transition metal salt solution to carry out ion exchange reaction to obtain a mixed solution;

[0060] (2) The mixed solution obtained in step (1) is subjected to solid-liquid separation to obtain a solid mixture;

[0061] (3) Calcining the solid mixture obtained in step (2) to obtain an AEI molecular sieve catalyst.

Embodiment 1

[0064] This example provides a method for NH 3 -AEI molecular sieve catalyst for SCR reaction and its preparation method and application, the AEI molecular sieve catalyst uses AEI molecular sieve as a carrier, and ion-exchange metal copper as an active component.

[0065] Its preparation method is:

[0066] (1) Prepare 0.1mol / L copper sulfate solution, mix aluminum-rich AEI molecular sieve with copper sulfate solution, wherein the mass ratio of AEI molecular sieve to copper sulfate solution is 1g:80mL, stir at 25°C for 12h for ionization exchange reaction to obtain a mixed solution;

[0067] (2) The mixed solution obtained in step (1) is suction filtered and washed 3 times to obtain a filter cake;

[0068] (3) Put the filter cake obtained in step (2) into an oven and dry it at 100°C for 12h, then bake it at 550°C for 5h in a muffle furnace to obtain a powdered Cu-AEI catalyst with an AEI configuration. The obtained catalyst is pressed into tablets, crushed, sieved, and 20-4...

Embodiment 2

[0075] This example provides a method for NH 3 -AEI molecular sieve catalyst for SCR reaction and its preparation method and application, the AEI molecular sieve catalyst is supported by AEI molecular sieve, and metal copper is loaded as an active component.

[0076] Its preparation method is with reference to the preparation method in Example 1, difference is: the copper nitrate solution of preparation 0.3mol / L in the step (1), and the quality of AEI molecular sieve and the volume ratio of copper nitrate solution are 1g:50mL, at 50 Stirring at ℃ for 8h for ion exchange reaction.

[0077]The resulting Cu-AEI catalyst was used for NH 3 -SCR reaction, its reaction conditions are the same as those in Example 1, and its catalytic activity testing method is the same as in Example 1. In the three test cases of A, B and C, the catalytic activity of the catalyst is as follows image 3 Shown, N 2 The amount of O produced is as Figure 4 shown.

[0078] Depend on image 3 and F...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention provides a composite catalyst for an NH3-SCR reaction and a preparation method and the application of the composite catalyst for the NH3-SCR reaction. The composite catalyst takes a molecular sieve as a carrier, and is loaded on transition metal on the molecular sieve to be taken as an active component through ion exchange. The method disclosed by the invention comprises the following steps: firstly, mixing the molecular sieve with a salt solution of the transition metal to perform an ion exchange reaction, and then carrying out solid-liquid separation and calcination to obtain an AEI molecular sieve catalyst. The composite catalyst prepared by the invention is non-toxic and harmless on used raw materials and simple and easy in preparation method and has the characteristics of high catalytic activity, low N2O formation amount, wide operating temperature window, capability of adapting to high-altitude velocity reaction conditions and the like, and suitability for carryingout catalytic purification of moving-source exhaust gases and stationary source flue gas nitrogen oxides as represented by diesel vehicle exhaust gases.

Description

technical field [0001] The invention belongs to the field of environmental pollution control and relates to a 3 -Composite catalyst for SCR reaction and its preparation method and application, especially a kind for NH 3 -AEI molecular sieve catalyst for SCR reaction, its preparation method and the application of catalytic purification of nitrogen oxides in mobile source tail gas and / or stationary source flue gas. Background technique [0002] Nitrogen oxide (NOx) is an important pollutant in air pollution. It can cause major environmental problems such as acid rain, smog, and photochemical smog. It not only has a major hazard to the ecological environment, but also endangers human health. Therefore, NOx removal is a The top priority of environmental protection today. Currently, in NH 3 Selective catalytic reduction of NOx(NH 3 -SCR) due to its high NOx conversion rate, the generated N 2 There is no secondary pollution, and the advantages of low reaction temperature have...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J29/72B01J37/30B01D53/56B01D53/86
CPCB01D53/8628B01D2251/2062B01J29/72B01J37/30B01J2229/18Y02C20/10
Inventor 贺泓单玉龙余运波石晓燕王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com